| 摘要 |
The invention relates to a device for generating X-rays (69) comprising a source (5) for emitting electrons and a carrier (7) which is provided with a material (9) which generates X-rays as a result of the incidence of electrons. The device comprises a dynamic groove bearing (17) having an internal bearing member (23) and an external bearing member (21) by means of which the carrier is journalled so as to be rotatable about an axis of rotation (15). A first one (21) of the bearing members is connected to the carrier. A bearing gap (57, 59, 61) containing a liquid lubricant is present between the bearing members. The bearing gap forms part of a heat transfer path via which the heat, which is generated during operation as a result of the electrons impinging upon the X-ray generating material, is conducted from the carrier to the surroundings of the device. To improve the rate of heat transfer via said heat transfer path, the carrier (7) and at least a portion (33, 37) of said first bearing member (21), which portion at least partially covers the bearing gap (57, 59, 61), constitute an integral part of the device. Preferably, the carrier and said portion of the first bearing member are manufactured from a single piece of material. In this manner the heat transfer path does not include any material separations between the carrier and the part of the bearing gap covered by said portion of the first bearing member.
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